"Essence is actually a clear, concentrated natural chemical that's been used for decades in products as varied as gravy, ice pops, coffee, shampoo and even insecticide, according to industry executives and scientists," the Journal reported.

Essence is created by heating items such as fruit and vegetable skins, rinds, and remnants at high temperatures, producing vapors. These vapors are condensed and then sold by the barrel.

La Croix did not confirm or deny the Journal's interpretation.

"The flavors are derived from the natural essence oils extracted from the named fruit used in each of our LaCroix flavors," the La Croix website reads. "There are no sugars or artificial ingredients contained in, nor added to, these extracted flavors."